They have tightened security along the border.

他们加强了边境的安全工作。

youdao

That's probably due to newly tightened security.

那或许是因为最近安检比较严。

youdao

U. S. troops tightened security around several key buildings in Baghdad Sunday, possibly in connection with Operation Desert Sidewinder.

美军星期天在巴格达几栋重要建筑物周围加强了安全戒备，可能同“沙漠响尾蛇行动”有关。

youdao

Authorities have tightened security across the country, as well as closed educational institutions until Monday.

VOA: standard.2009.10.24

Independent Russian military expert Alexander Golts says the situation suggests that security in the North Caucasus cannot be tightened further.

VOA: special.2010.04.03

The Bruins resumed play on Wednesday night amid tightened security at home against the Sabres.

NPR: Red Sox, Bruins Postpone Games During Manhunt

The Yemeni authorities have tightened security measures at Sanaa's airport, as well as around several other embassies.

BBC: Yemen instability poses a 'global threat', says Clinton

Officials also have tightened security in schools by hiring extra guards to escort students to and from class.

CNN: Schools in China prepare for copycat attacks